Prompt Global Strike

Prompt Global Strike (PGS) is a United States military effort to develop a system that can deliver a precision-guidedconventional weaponairstrike anywhere in the world within one hour, in a similar manner to a nuclearICBM.[1][2] Such a weapon would allow the United States to respond far more swiftly to rapidly emerging threats than is possible with conventional forces. A PGS system could also be useful during a nuclear conflict, potentially replacing the use of nuclear weapons against 30% of targets.[3] The PGS program encompasses numerous established and emerging technologies, including conventional surface-launched missiles and air- and submarine-launched hypersonic missiles, although no specific PGS system has yet been finalized as of 2015.

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The PGS system is intended to complement existing American rapid-response forces, such as Forward Deployed Forces, Air Expeditionary Groups (which can deploy within 48 hours) and carrier battle groups (which can respond within 96 hours).[4] Possible delivery systems for PGS warheads include:

A potential enemy cannot be certain that a launched ICBM contains only a conventional warhead, not a nuclear one. It is thus currently unclear what design features or precautions could convince China and Russia, two countries with advanced launch-detection systems and nuclear ICBMs, to ignore their early-warning systems. Current ideas include a low-trajectory missile design, or allowing Russian and Chinese inspection of PGS missile sites.[4][5]

On 11 April 2010, United States Secretary of DefenseRobert Gates indicated that the United States already had a Prompt Global Strike capability.[11] This coincided with the New START disarmament treaty signed on 8 April 2010, which set new, lower limits on arsenals of ballistic missiles and their warheads. The treaty does not distinguish between conventional and nuclear versions of weapons, meaning any ballistic PGS missiles and warheads would count toward the new limit. However, the U.S. State Department stated in 2010 that this would not constrain plans for PGS deployment, since plans for the system at that time did not come near the New START limits.[12]

On 18 November 2011, the first Advanced Hypersonic Weapon (AHW) glide vehicle was successfully tested by the U.S. Army Space and Missile Defense Command as part of the Prompt Global Strike program.[13] The missile was launched from the Pacific Missile Range Facility in Hawaii, and struck a target at the Reagan Test Site on Kwajalein Atoll, over 3,700 kilometres (2,300 mi) away, in under 30 minutes.[14] The prototype, which incorporated technologies developed by Sandia National Laboratories, was used to gather data to assist the development of future hypersonic warheads.[15] The AHW followed an endo-atmospheric (within earth atmosphere, at altitude below 100 kilometers) non-ballistic trajectory during the test flight. This is a crucial design feature, as following a depressed trajectory that is much lower and flatter than a normal ICBM prevents other nuclear-armed nations from mistakenly thinking the AHW is a nuclear-tipped missile.[16]

The second AHW test flight occurred on 25 August 2014 from the Kodiak Launch Complex in Alaska. The mission was terminated shortly after liftoff due to an anomaly in the launch vehicle.[17] Operators triggered a self-destruct sequence four seconds after launching, with eyewitnesses claiming the weapon had veered off trajectory just as it took off.[18] A Failure Review Board released the results of their investigation into the failed launch in early February 2015. The board determined that an external thermal protective cover, designed to regulate motor temperature, interfered with the launch vehicle's steering assembly; no issues were found with the hypersonic glide body, booster motors, or the Kodiak Launch Complex, and the board determined the test range flight safety officer correctly followed established protocol and procedures.[19]

The HTV-2 Falcon project is also in the development stage of conducting test flights.

In January 2012, the Pentagon stated that the PGS launch platform would be submarine-based.[20] However, practical efforts to develop the PGS system were delayed by fears of accidentally starting a nuclear conflict.[20] In February 2014, the U.S. Navy solicited proposals for two-year industry trade studies to test the feasibility of developing a hypersonic submarine-launched intermediate-range conventional PGS weapon. The Navy specified that the effort was a study to evaluate technology options, not to develop a system-level specific CPGS solution. The Navy stated that it would be interested in awarding one or two 13-month technology evaluation contracts, each worth around US$5 million.[21]

The Orbital Test Vehicles (OTV-1 and OTV-2) are on the left, and the X-34 is on the right. Some say they could be part of a reconnaissance program, a space bomber, or even a military satellite delivery system.

In December 2010, Russian military experts indicated that the forthcoming S-500missile defense system would include anti-hypersonic defenses.[22] In December 2012, commenting on the development of a replacement for its R-36M2 Voevoda ICBM, the commander of the Russian Strategic Missile Forces, Sergey Karakaev, stated that the missile would allow Russia "to realize such opportunities as the creation of high precision strategic weapons with non-nuclear warheads and a practical global range. Russia can create non-nuclear, high precision weapons based on intercontinental rockets in the event that the USA also works on designing such a weapon". On 11 December 2013, Vice Prime Minister Dmitry Rogozin warned that Russia would use nuclear weapons if it came under an attack, adding that this possibility serves as the main deterrent to potential aggressors. Rogozin also stated that the Russian Fund of Perspective Researches (FPI) would develop a military response to the PGS system.[23] However, most of the Russian's progress is classified.

According to some observers, the Russian Yu-71hypersonicboost-glide system is under test flights since 2011, though its predecessors date back to 2001.[25]

In October 2015, while attending a non-proliferation conference in New York, the Russian Foreign Ministry's Department of Non-proliferation, Disarmament, and Arms Control Mikhail Ulyanov stated "It is the policy of the United States that is the most serious obstacle in the further reduction in nuclear arms. This is because of their persistent implementation of their line objectively rocking global strategic stability through the unilateral creation of a global system of anti-missile defense that gradually complements the conception of a Prompt Global Strike, which hampers the beginning of negotiations on the prohibition of placing weapons in space and lack of any type of progress in ratifying the CTBT,"[26]

The Chinese People's Liberation Army began developing its own long-range hypersonic missile, the WU-14 rocket-boosted hypersonic glide vehicle, in the 2010s.[27] The WU-14, which is similar to the PGS/HTV-2 system, underwent its first full-scale flight test in January 2014, and conducted few more flight tests later, of which only one failed.[27][28] As with Russia's efforts, little is publicly known about the progress of the Chinese hypersonic glide vehicle program.

^"'Meet the Press' transcript". MSNBC. 11 April 2010. Retrieved 18 June 2013. And we have prompt global strike affording us some conventional alternatives on long-range missiles that we didn't have before